/Engine/Plugins/MovieScene/SequencerScripting/Source/SequencerScripting/Public/ExtensionLibraries/MovieSceneTrackExtensions.h
Set the section to key for this track. When properties for this section are modified externally, this section will receive those modifications and act accordingly (add/update keys). This is especially useful when there are multiple overlapping sections.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Sequencer|Track", Meta=(ScriptMethod, DevelopmentOnly)) static void SetSectionToKey ( [UMovieSceneTrack](API\Runtime\MovieScene\UMovieSceneTrack) * Track, [UMovieSceneSection](API\Runtime\MovieScene\UMovieSceneSection) * Section )